Qingdao National VI Dongfeng 3308-mm Wheelbase Sewage Treatment Vehicle Government Procurement Case: Upgrading Outdated Equipment and Interpretation of the Winning Solution. Against the backdrop of accelerating urbanization, sewage treatment has become one of the core responsibilities of municipal sanitation departments. In late 2025, the Urban Management Bureau of a district in Qingdao launched a new round of sanitation equipment procurement, with sewage treatment vehicles serving as critical equipment—undergoing a full process from identifying pain points of outdated units to implementing the new solution. This article reconstructs this real-world case based on publicly available tender information and procurement practices, and interprets the solution provided by Chengli Special Purpose Vehicle Co., Ltd. I. Pain Points of Outdated Equipment: Low Efficiency, High Maintenance Difficulty, and Non-Compliance The municipal sanitation department in Qingdao previously operated three sewage treatment vehicles purchased in 2018—all non-National VI emission-compliant units. After six years of service, multiple issues emerged: • Emission Non-Compliance: The National V standard no longer meets Qingdao’s mandatory National VI emission requirements effective in 2025; annual inspections frequently failed, increasing operational costs. • Low Treatment Efficiency: Outdated units had a daily processing capacity of only ~30 m³. During summer rainfall-induced surges in wastewater volume, they routinely operated beyond capacity, resulting in overflow incidents and public complaints. • Poor Sealing Performance: Aging tanks leaked during operation, causing odor dispersion that disturbed nearby residents—and prompting repeated regulatory interviews by environmental authorities. • High Maintenance Costs: Critical components—including sewage pumps and filtration systems—experienced frequent failures. Annual maintenance cost per unit reached RMB 30,000–50,000, with scarce spare parts availability and prolonged downtime. • Complex Operation: These older units required three skilled operators working in tandem, straining human resources and necessitating lengthy training periods. Per local procurement conventions, the department planned to allocate approximately RMB 1.985–2.426 million in its 2026 budget for purchasing three National VI-compliant sewage treatment vehicles, specifying minimum daily treatment capacity of ≥50 m³ per unit, automated control functionality, and remote monitoring capability. II. New Requirements Assessment: Balancing Technical Specifications and Budget In Q1 2026, the department established a procurement task force to evaluate mainstream sewage treatment vehicle brands on the market. Key requirements included: • Chassis: National VI emission compliance; Dongfeng brand preferred (due to extensive local service network coverage); wheelbase between 3,000–3,500 mm to suit narrow urban roads in Qingdao. • Superstructure Configuration: Tank capacity ≥8 m³; equipped with high-efficiency sewage separation system, automatic sludge discharge device, high-pressure cleaning pump, and remote data transmission capability. • Budget Control: Unit price target ~RMB 600,000–700,000 (based on publicly disclosed tender data); total budget capped at RMB 2.426 million. • Delivery Timeline: Delivery within 30 days after contract signing to ensure deployment before the flood season. The procurement task force ultimately selected Chengli Special Purpose Vehicle Co., Ltd.’s 'National VI Dongfeng 3308-mm Wheelbase Sewage Treatment Vehicle' (model CLW5070GSSD6, derived from the Dongfeng 3308-mm wheelbase platform). As a leading special-purpose vehicle manufacturer based in Suizhou, Chengli maintains a database of 946 product specifications and 114 verified government tender records. It has previously served over 500 municipal sanitation clients—including supplying 15 street sweepers to Wuhan Municipal Urban Management Bureau and four cleaning & suctio